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https://issues.apache.org/jira/browse/HDFS-4758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642234#comment-13642234
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Todd Lipcon commented on HDFS-4758:
-----------------------------------
Based on the discussion at the contributors meetup a few months back, didn't a
lot of us anticipate the use case of a snapshottable /user, and then allowing
each user or application to then make snapshots of their own /user/foo? Or a
snapshottable root directory and then snapshottable subdirs?
> Disallow nested snapshottable directories
> -----------------------------------------
>
> Key: HDFS-4758
> URL: https://issues.apache.org/jira/browse/HDFS-4758
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
>
> Nested snapshottable directories are supported by the current implementation.
> However, it seems that there are no good use cases for nested snapshottable
> directories. So we disable it for now until someone has a valid use case for
> it.
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